【程式碼筆記】Web-JavaScript-JavaScript字串
阿新 • • 發佈：2018-12-07
一，效果圖。
二，程式碼。
<!DOCTYPE html>
<html> <head> <meta charset="utf-8"> <title>javascript 字串</title> </head> <body> <p id="demo"></p> <script> var x = 'It\'s alright'; var y = "He is called \"Johnny\""; document.getElementById("demo").innerHTML = x + "<br>" + y; </script> <script> var txt = "hello world"; document.write("<p>" + txt.length + "</p>"); var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; document.write("<p>" + txt.length + "</p>"); </script> <p id="demo"></p> <script> var x = "John"; // x is a string var y = new String("John"); // y is an object document.getElementById("demo").innerHTML = typeof x + " " + typeof y; </script> <script> var x = "John"; // x 是字串 var y = new String("John"); // y 是一個物件 document.getElementById("demo").innerHTML = x === y; </script> <p>=== 為絕對相等，即資料型別與值都必須相等。</p> </body> </html>
參考資料：《菜鳥教程》
一，效果圖。
二，程式碼。
<!DOCTYPE html>
<html> <head> <meta charset="utf-8"> <title>javascript 字串</title> </head> <body> <p id="demo"></p> <script> var x = 'It\'s alright'; var y = "He is called \"Johnny\""; document.getElementById("demo").innerHTML = x + "<br>" + y; </script> <script> var txt = "hello world"; document.write("<p>" + txt.length + "</p>"); var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; document.write("<p>" + txt.length + "</p>"); </script> <p id="demo"></p> <script> var x = "John"; // x is a string var y = new String("John"); // y is an object document.getElementById("demo").innerHTML = typeof x + " " + typeof y; </script> <script> var x = "John"; // x 是字串 var y = new String("John"); // y 是一個物件 document.getElementById("demo").innerHTML = x === y; </script> <p>=== 為絕對相等，即資料型別與值都必須相等。</p> </body> </html>
參考資料：《菜鳥教程》